JP4623498B2 - Display device - Google Patents

Description

  The present invention relates to a liquid crystal display (LCD), a plasma display (PDP), an inorganic or organic electroluminescence (EL) display, a light emitting diode (LED) display, a fluorescent display tube, a field emission display, and an electrophoretic display. The present invention relates to display devices such as devices, electrochromic display devices, and cathode ray tube (CRT) display devices.

  Flat panel displays (hereinafter referred to as FPDs) such as liquid crystal displays, plasma displays, and EL displays have pixels arranged in a matrix on a substrate such as glass, plastic, or semiconductor, and receive electrical signals from the outside. Thus, an image is displayed by optically controlling an arbitrary pixel. Each pixel is generally composed of three primary colors of red, green, and blue, and each of these pixels is a minimum unit driven by different signals.

  In the FPD, the pixel size is determined by the size and resolution. For example, in a WXGA (wide eXtended Graphics Array) FPD having a diagonal of 37 inches and a resolution of 1366 × 768, the size of one pixel is 600 μm square. The shape of the pixel may be not square depending on the specifications of the display, but is generally square. The size of one pixel is 600 μm × 600 μm. For example, when one pixel is formed from striped picture elements of R (red), G (green), and B (blue), the size of one picture element is one pixel. The width is divided into three equal parts of 200 μm × 600 μm.

  FIG. 13 is a schematic plan view of a general pixel. The pixel 101 includes a red picture element 102, a green picture element 103, and a blue picture element 104. A red picture element signal line 105 is electrically connected to the red picture element 102, a green picture element signal line 106 is electrically connected to the green picture element 103, and a blue picture element signal line 107 is electrically connected to the blue picture element 104. It is connected. In many liquid crystal display devices and organic EL displays, signal lines are connected to picture elements via thin film transistors (TFTs), diodes, and the like. In the case of a duty display such as a plasma display, the signal line itself is a picture element. The picture elements 102, 103, and 104 are driven and displayed in a matrix by signals supplied from the respective signal lines.

  In general, the human eye has high green visibility, and the lightness ratio of the three primary colors of red, green and blue is approximately 5: 12: 2. In the stripe arrangement, picture elements of the same color are arranged in the vertical direction. Therefore, when white is displayed on the entire surface, yellow vertical lines and blue vertical lines, which are a composite color of red and green, are periodically arranged, and are visually recognized as vertical stripes. . Whether it is a display other than white or, for example, a display of a person's face or wallpaper without a pattern, vertical stripes (vertical stripes) are generated in all, and the display quality is impaired.

  This phenomenon will be described in detail with reference to FIG. FIG. 1 is a diagram called Campbell-Robson CSF Chart. In this figure, the horizontal axis represents the fineness of the stripe, and the vertical axis represents the luminance ratio (contrast) of the stripe. The shade of the stripe is regarded as a wave, and the horizontal axis is represented by an index called spatial frequency. The spatial frequency is represented by the number of black-and-white line & space pairs existing in the field of view of 1 °. The unit is cycle / degree. The luminance ratio (contrast) of the stripes is represented by an 8-bit gray scale (256 gradations) on the display. Specifically, the top of the vertical axis is 128 gradations (contrast = 1), and the bottom is 0 gradation and 255 gradations (contrast is about 500 to 1000).

  FIG. 2 is a graph showing a resolution limit curve measured using Campbell-Robson CSF Chart. The vertical and horizontal axes of the graph are the same as the Campbell-Robson CSF Chart described above. The inside of the curve shown in FIG. 2 is an area where vertical stripes are visible. It can be seen from FIG. 2 that the vertical stripes of the picture element are related to the distance from the observer to the display, the picture element size, and the contrast.

  Since contrast is the ratio of the intensity of blue to the sum of the intensities of green and red, it can be calculated theoretically. For example, in the case of a liquid crystal display device, the color intensity ratio can be substituted for the color intensity ratio. The transmittance of a typical blue color filter is 8.7%, the transmittance of a green color filter is 57%, and the transmittance of a red color filter is 22%. Therefore, when calculating using these values, (57 + 22) /8.7=9.1. That is, the contrast is about 9. If the color filter changes, the transmittance also changes, and in the case of a light emitting display such as a PDP, the brightness is measured instead of the transmittance. However, as long as the display device displays an image with three primary colors of RGB, the contrast is about 9. There is no. Therefore, the shorter the distance from the viewer to the display and the larger the pixel size, in other words, the lower the resolution, the easier the vertical stripes are seen.

  Further, with respect to pixel arrangements other than the three primary colors of red, green, and blue, stripes due to the picture element having the highest visibility and the picture element having the lowest visibility are visually recognized based on the same principle. For example, in the case of a pixel arrangement of three colors of cyan, magenta, and yellow, a stripe is visually recognized between a yellow pixel having the highest visual sensitivity and a magenta pixel having the lowest visual sensitivity, and white is added to red, green, and blue 4 In the case of a color pixel array, stripes are visually recognized between a white picture element having the highest visibility and a blue picture element having the lowest visibility. Further, even in a five-color pixel array in which cyan and yellow are added to red, green, and blue, stripes are visually recognized between green having the highest visibility and blue picture elements having the lowest visibility.

  By the way, if the FPD is used for TV, the distance from the observer to the display is suitably 3 times the diagonal size as in the case of a conventional CRT TV. However, in the case of a TV for personal use that also serves as a PC (personal computer) monitor, the viewing distance to the display is relatively short and is often used at a viewing distance of a diagonal size or less. Further, a TV for personal use requires higher brightness than a conventional PC monitor. Therefore, when the distance is set according to the purpose of use, the display quality is impaired by vertical stripes unless the resolution exceeds a certain value.

  Specifically, when the resolution limit with a contrast of 9 is read from FIG. 2, it is about 13 cycle / degree. If this resolution limit is applied when the distance from the observer to the display is 50 cm, the picture element size (pitch) is equivalent to 400 μm, and vertical stripes can be seen in picture elements with a larger pitch. For example, in the case of a VGA (Video Graphics Array) class display having a diagonal size of 50 cm (19.7 inches) and a resolution of 640 × 480, the size (pitch) of one picture element is 680 μm, so vertical stripes are visually recognized. The display quality is impaired.

  The generation of vertical stripes due to the stripe arrangement can be alleviated to some extent by adopting the delta arrangement, the mosaic arrangement, or the square arrangement disclosed in Patent Document 1 or the like. It does not lead to. Furthermore, in the case of an image with a clear edge such as a text display or a vector image, coloring occurs at the edge, which is a problem for personal computer monitors and computer graphics applications.

  In Patent Document 2, n (n is an integer of 2 or more) color filters are arranged in the same color in the vertical direction, and m (m is an integer of 2 or more) of the same color are arranged in sequence in the horizontal direction. There is disclosed a liquid crystal display device in which one pixel is composed of n × m × l (l is a natural number) pixels arranged. However, it is not preferable to increase the display resolution higher than the resolution of the input signal because the cost of peripheral circuits such as a drive circuit and a controller increases. Further, when a signal having a resolution lower than the resolution of the display device is input to the display device, for example, when a signal having a VGA resolution is input to an XGA (eXtended Graphics Array) display panel, the signal resolution is set by image processing. Since it is necessary to raise, an extra circuit is required.

Patent Document 3 discloses a pixel having a checkerboard-like arrangement in which a blue picture element is arranged at the center. By adopting this arrangement, at least vertical stripes are not visible. However, even if a checkerboard-like arrangement is made without changing the resolution, the spatial frequency does not change, so that it becomes a mixed stripe of vertical stripes, horizontal stripes and diagonal stripes, and this problem is not solved.
JP-A-6-102503 JP 2001-272689 Candice Hellen Brown Elliott, Reducing Pixel Count without Reducing Image Quality, “Information Display”, USA, The Society for Information Display, December 1999, Vol. 15, No. 12, p. 22-25

  One of the objects of the present invention is to suppress deterioration in display quality due to vertical stripes without increasing the cost of peripheral circuits.

The display device of the present invention is a display device having a plurality of pixels arranged in a matrix, and each pixel has a plurality of sets of pixel groups each including three or more color pixel elements, The pixels of the same color included in the pixel are driven by the same signal , the pixel is composed of two sets of pixel groups adjacent in the row direction, and each of the two sets of pixel groups is periodically one. Composed of three or more color pixels arranged in the direction, each of the two sets of pixel groups is composed of three color pixels periodically arranged in one direction, and two adjacent pixels in the row direction. The polarity of the picture element included in one pixel among the pixels is + .-. +. + .-. +, And the polarity of the pixel included in the other pixel is-. + .-.-. And a plurality of signal lines extending in the column direction and electrically connected to the picture elements, A picture element is sandwiched between two signal lines adjacent in the row direction, and the aperture ratio of the picture element sandwiched between the signal lines of the same polarity is the aperture ratio of the other pixel elements of the same color included in the pixel. And different.

Each of the two sets of picture element groups is composed of five color picture elements periodically arranged in one direction, and the polarity of the picture element included in one of the two pixels adjacent in the row direction. Is + .-. + .-. +. + .-. + .-. + And the polarity of the picture element contained in the other pixel is-. + .-. + .-.-. + .- -+--May be sufficient.

The aperture ratio of the pixel having the lowest visibility among the pixels constituting the pixel group sandwiched between the signal lines having the same polarity is the other pixel of the same color included in the pixel. The opening ratio may be lower in the range of 10% to 30%.

The picture element sandwiched between the signal lines having the same polarity may be a picture element having the lowest visibility among the picture elements constituting the picture element group.

The display device of the present invention may further include a drive circuit that outputs a signal for driving the picture element. In this case, it is preferable that the signal output from the drive circuit is branched into a plurality of signals to drive the pixels of the same color .

  In the display device of the present invention, the picture element having the lowest visibility among the picture elements constituting the picture element group is the picture element having the highest visibility and the second highest visibility. May be arranged in the row direction.

  The picture element group may be composed of three color picture elements of red, green and blue, or may be composed of three color elements of cyan, magenta and yellow. The picture element group may be composed of four color picture elements of red, green, blue and white, or may be composed of five color picture elements of red, green, blue, yellow and cyan.

  In this specification, “row direction” and “column direction” mean two directions intersecting each other, and do not necessarily mean a horizontal direction and a vertical direction.

  According to the present invention, it is possible to suppress deterioration in display quality due to vertical stripes without increasing the cost of peripheral circuits.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, a liquid crystal display device will be described. The display device of the present invention is not limited to a liquid crystal display device, but an inorganic or organic EL display device, a PDP, an LED display device, a fluorescent display tube, and a field emission display device. And various display devices such as an electrophoretic display device, an electrochromic display device, and a CRT display device.

  In the reference numerals shown below, in order to collectively represent the homologous components, the letters may be omitted and only the numbers may be written. For example, the first red picture element 2a and the second red picture element 2b may be collectively referred to as the red picture element 2.

(Embodiment 1)
FIG. 3 is a partial cross-sectional view schematically showing the liquid crystal display device of the first embodiment. The liquid crystal display device includes a liquid crystal panel, a drive circuit unit for driving the liquid crystal panel, and a light source such as a backlight in the case of a transmissive liquid crystal display device. The liquid crystal panel includes a TFT (Thin Film Transistor) substrate 10, a CF (color filter) substrate 11 disposed opposite thereto, a peripheral sealing material 12 sandwiched between the substrates 10 and 11, and the substrates 10 and 11. The liquid crystal layer 13 is sandwiched and surrounded by the peripheral sealing material 12, and the pair of polarizing plates 14 and 15 are attached to the outer surfaces of the substrates 10 and 11, respectively.

  The TFT substrate 10 includes a plurality of scanning lines (not shown) extending in the row direction, a plurality of signal lines 5, 6, and 7 that intersect the scanning lines and extend in the column direction, and the scanning lines and signal lines 5, 6, and 7. TFTs (not shown) provided in the vicinity of the intersections of the pixels, and transparent pixel electrodes (hereinafter also referred to as pixel electrodes) 16 connected to the signal lines 5, 6 and 7 via the TFTs and arranged in a matrix. And a liquid crystal alignment film 17 made of polyimide or the like.

  The CF substrate 11 includes three color filter layers 2, 3 and 4 of red, green and blue, a light shielding layer 18 made of chromium or black resin, a common transparent electrode 19 made of ITO (indium tin oxide), etc., and a common transparent A liquid crystal alignment film 20 covering the electrode 19 is provided.

  Examples of the material of both the substrates 10 and 11 include quartz glass, soda lime glass, borosilicate glass, low alkali glass and non-alkali glass, plastic such as polyester and polyimide, and semiconductor such as silicon.

A manufacturing process of the liquid crystal panel will be described. First, a method for producing the TFT substrate 10 will be described. Thickness of about 100-200nm with Ta or TaMo alloy on glass substrate by sputtering method
After forming the thin film, a scanning line having a predetermined pattern is formed by a photoetching process. After an insulating film such as SiNx is formed thereon, an a-Si layer and an etch stopper layer (SiNx) are formed, and a TFT element is formed by a photo process. Next, a source metal is formed with Ti or the like, and signal lines 5, 6, 7 having a predetermined pattern, drains, and the like are formed by photoetching. Further, after forming a protective film such as Si and a contact hole, an ITO film is formed, and the pixel electrode 16 is formed by a photoetching process. A polyimide-based liquid crystal alignment film 17 is printed on the TFT substrate 10 thus prepared and baked. Usually, the thickness of the liquid crystal alignment film 17 is formed in the range of 50 to 100 nm. Thereafter, rubbing is performed in one direction with a rotating cloth.

  Next, a method for producing the color filter substrate 11 will be described. A black mask material of Cr (chrome) or black resin is applied on the glass substrate, and the light shielding layer 18 is formed by a photo process. For each of red, green, and blue, color filter film coating, a predetermined pattern formation by a photo process, and baking are performed to form red, green, and blue color filter layers 2, 3, and 4. A common transparent electrode 19 is formed by depositing an ITO film through a mask. Similar to the TFT substrate 10, a liquid crystal alignment film 20 is formed on the CF substrate 11.

  Spacers are spread on the TFT substrate 10 or the CF substrate 11 or the peripheral sealing material 12 is printed, the substrates 10 and 11 are bonded together, and firing is performed. After the bonded substrates are divided into panel units, a TN (Twisted Nematic) liquid crystal material is injected into the cells of the produced panel and sealed. Polarizers 14 and 15 are attached to both sides of the panel to complete the liquid crystal panel.

  In the liquid crystal display device according to the present embodiment, a region where the pixel transparent electrode 16 and the common transparent electrode 19 facing the pixel transparent electrode 16 overlap is a pixel. Strictly speaking, a region corresponding to the opening of the light shielding layer 18 among the regions to which a voltage is applied according to the state to be displayed is a picture element. Hereinafter, for the convenience of description, the picture elements corresponding to the red, green, and blue color filter layers 2, 3, and 4 are referred to as a red picture element 2, a green picture element 3, and a blue picture element 4, respectively. Further, the picture element transparent electrode 16 may be simply referred to as “picture element”. Note that the display device of the present invention is not limited to the active matrix liquid crystal display device exemplified in this embodiment, and can be applied to, for example, a simple matrix liquid crystal display device. In a simple matrix type liquid crystal display device, each region where a column electrode provided in a stripe shape and a stripe-like row electrode intersecting the column electrode overlap each other is a picture element.

  FIG. 4 is a schematic diagram of one pixel in the liquid crystal display device according to the first embodiment. The liquid crystal display device of this embodiment has a plurality of pixels 1 arranged in a matrix. One pixel 1 is composed of two sets of picture element groups 1a and 1b adjacent in the row direction. Each of the picture element groups 1a and 1b has picture elements 2, 3, and 4 of three colors of red, green, and blue that are periodically arranged in one direction (in this embodiment, the row direction). Specifically, the first and second red picture elements 2a and 2b, the first and second green picture elements 3a and 3b, and the first and second blue picture elements 4a and 4b are included in one pixel 1. That is, two pixel regions having the same color exist in one pixel 1.

  The liquid crystal display device of this embodiment will be described by taking a VGA class display having a diagonal of 19.7 inches and a resolution of 640 × 480 as an example. The size of one pixel 1 is 680 μm square. Since each picture element 2, 3, 4 is strip-shaped, the width (length in the row direction) of each picture element 2, 3, 4 is about 113 μm, and the width of each picture element group 1a, 1b is about 340. (About 113 μm × 3).

  When this display is viewed from a distance of 50 cm, yellow and blue lines and spaces of 25.7 cycle / degree are observed within a 1 ° field of view. On the other hand, in the display of the conventional example shown in FIG. 13, the line & space is 12.8 cycle / degree. FIG. 5 is a graph showing a resolution limit curve in which the values of the lines and spaces of the respective displays of the present embodiment and the conventional example are entered. Point a in FIG. 5 represents the value of the conventional example, and point b represents the value of the present embodiment. As shown in FIG. 5, the conventional example is within the resolution limit, and yellow and blue vertical stripes are observed. On the other hand, in this embodiment, it is outside the resolution limit, and vertical stripes are not visually recognized.

  The drive circuit unit according to the present embodiment includes a liquid crystal controller (not shown) that performs signal processing based on an externally input signal, and a signal line drive circuit (not shown) that outputs a video signal based on an instruction from the liquid crystal controller. And a scanning line driving circuit (not shown) for outputting a scanning pulse based on an instruction from the liquid crystal controller. The liquid crystal controller is electrically connected to the liquid crystal panel via a TCP (Tape Carrier Package). A signal line driving circuit and a scanning line driving circuit are mounted on the TCP.

  The picture elements 2, 3, 4 are electrically connected to the corresponding signal lines 5, 6, 7, and video signals from the signal lines 5, 6, 7 are input through the TFTs. More specifically, a scanning pulse is sequentially applied from a scanning line driving circuit to each of a plurality of scanning lines extending in the row direction from the scanning line driving circuit every horizontal scanning period (for example, every row). Video signals supplied from the signal line driving circuit via the signal lines 5, 6, 7 are input to the corresponding picture elements 2, 3, 4 through the TFT selected by the scanning pulse. For simplification of description, the signal lines 5, 6, and 7 between the picture elements in FIG. 4 are omitted.

  In the present embodiment, the video signal output from the signal line driving circuit branches into two to drive the same color picture elements included in one pixel. In other words, picture elements of the same color included in one pixel are driven by the same signal. Specifically, the red picture element signal line 5 for supplying a video signal to the red picture element 2 is branched into two signal lines 5 a and 5 b outside the display area (active area) on the TFT substrate 10. . The two signal lines 5a and 5b are electrically connected to the pixel transparent electrodes 16 of the first and second red picture elements 2a and 2b, respectively. Thus, one video signal output from the signal line driving circuit is branched into two to drive the first and second red picture elements 2a and 2b. Similarly, the green picture element signal line 6 and the blue picture element signal line 7 are branched into two signal lines 6a, 6b, 7a and 7b, respectively.

  As described above, one video signal output from the signal line driver circuit is branched into two, so that the deterioration of display quality due to vertical stripes can be reduced, and the number of outputs of the signal line driver circuit is the conventional one. Can be the same. Therefore, an increase in the cost of the peripheral circuit can be avoided.

  The signal line can be branched in the vicinity of the terminal portion of the signal line driver circuit. In this case, a location where the branched signal line and another signal line intersect is generated. This will be specifically described with reference to FIG. For example, a location where the first green picture element signal line 6 a branched from the green picture element signal line 6 and the second red picture element signal line 5 b branched from the red picture element signal line 5 occurs. In order to avoid a short circuit at the intersection of both signal lines 6a and 5b, for example, an insulating film is formed on the second red pixel signal line 5b and the first green picture element signal is straddled over the insulating film. The line 6a can also be formed. However, in this method, since the source metal patterning step needs to be performed twice, the manufacturing cost increases. A method for avoiding a short circuit at the intersection of the signal lines 6a and 5b without adding a new process in the above TFT manufacturing process will be described with reference to FIG.

  FIG. 6 is a schematic plan view for explaining a manufacturing process in the vicinity of the intersection between the first green picture element signal line 6a and the second red picture element signal line 5b. First, as shown in FIG. 6A, simultaneously with the creation of the scanning line, the connection portion 30 between the green pixel signal line 6 and the first green pixel signal line 6a is formed using gate metal. As shown in FIG. 6B, simultaneously with the patterning of the gate insulating film, an interlayer insulating film 31 is formed in a region where the signal line 5b on the connection portion 30 intersects. Next, signal lines 5, 6, and 7 are formed from the source metal. At this time, as shown in FIG. 6C, the source metal is formed so that both signal lines 6 and 6a are connected via the connecting portion 30 and the signal line 5b straddles the interlayer insulating film 31. Patterning is performed. In FIG. 6, the connecting portion 30 is exposed except for the region of the interlayer insulating film 31, but the connecting portion 30 is covered with a gate insulating film, and both signal lines 6 and 6b are connected to the connecting portion 30 through contact holes. You may make it connect to.

  In this embodiment, the branch wiring is formed in the frame region from the connection terminal of the signal line driving circuit to the active area, but the present invention is not limited to this. For example, if there is no area on the glass substrate, branch wiring may be formed in the signal line driver circuit or TCP.

  Next, a driving method of the liquid crystal display device of this embodiment will be described. The liquid crystal display device needs to be AC driven in terms of display characteristics, and the polarity of the plus / minus voltage is inverted for each refresh rate of the input signal. Further, in order to prevent the AC component from being recognized as flicker, polarity inversion driving is performed so that the positive and negative voltage polarities are reversed between adjacent picture elements. The polarity inversion pattern includes line inversion driving for inverting the polarity for each scanning line or signal line, and dot inversion driving for inverting the polarity for each picture element. As a variation, there is 2H dot inversion driving in which the polarity is inverted for each picture element along the scanning line and for every two picture elements (for each signal in two horizontal scanning periods) along the signal line. Since these dot inversion driving is strong against crosstalk, it is easy to obtain high display quality.

  However, in the liquid crystal display device according to the present embodiment, one pixel is formed by six picture elements 2, 3, and 4 of red green blue red green blue. In order to perform dot inversion driving like + .-. + .-. + .-, it is necessary to further invert the polarity of the signal output from the driving circuit. For example, in order to supply a positive polarity voltage to the signal line 5a for the first red picture element 2a and a negative polarity voltage to the signal line 5b for the second red picture element 2b, On the other hand, it is necessary to invert the polarity of the signal output from the signal line driving circuit.

  In the present embodiment, the polarity inversion pattern of the pixel 1 is assumed to be two types: + • − • + • + • − • + and − • + • − • − • + • −. These two patterns are preferably adjacent in the row direction. In other words, the polarities of the six picture elements 2, 3, and 4 included in one pixel 1 out of two pixels 1 adjacent in the row direction are + · − · + · + · − · +, and the other pixel It is preferable that the polarities of the six picture elements 2, 3, and 4 included in 1 are-· + ·-·-· + ·-. As a result, the polarities of two adjacent picture elements between the two pixels are reversed, so that flicker is difficult to recognize and shadowing (crosstalk via the power supply line) is prevented.

  FIG. 7 is a diagram showing the polarity of each picture element included in one pixel. The pixel 1 shown in FIG. 7 has the polarities of +,-, +, +,-, + in order from the left picture element 2a. In other words, a positive polarity signal (voltage) from the red picture element signal line 5 to the first and second red picture elements 2a and 2b and from the blue picture element signal line 7 to the first and second blue picture elements 4a and 4b, respectively. 7 is applied to the first and second green picture elements 3a and 3b from the green picture element signal line 6, and FIG. 7 shows a state where a negative polarity signal (voltage) is applied.

  The polarity shown in FIG. 7 represents a state in which the TFTs connected to the picture elements 2, 3, and 4 are turned on, in other words, a state in one horizontal scanning period. Corresponding to the scanning of the scanning line in which the TFT is on, a rectangular wave having a certain amplitude is applied from the signal lines 5, 6, 7 to the picture elements 2, 3, 4. The polarities of the picture elements 2, 3, and 4 are inverted every predetermined period, for example, one field period.

  In a plan view, each picture element 2, 3, 4 is sandwiched between signal lines 5, 6, 7 adjacent in the row direction. Of the six picture elements 2, 3, and 4 included in one pixel, the first blue picture element 4a is sandwiched between signal lines 7a and 5b that supply voltages of the same polarity (positive polarity in FIG. 7). On the other hand, the other five picture elements 2a, 2b, 3a, 3b, and 4b other than the first blue picture element 4a are sandwiched between signal lines 5, 6, and 7 that supply voltages of opposite polarity. For example, the first red picture element 2a is sandwiched between a positive polarity signal line 5a and a negative polarity signal line 6a.

  Depending on the coupling capacitance of the signal lines 5, 6, 7 and the picture elements 2, 3, 4, [effective voltage value of the signal line for one field period with respect to the picture element electrode] × [capacitance between the picture element electrode and the signal line ] The voltage superposed by [total pixel capacity] is applied to the liquid crystal layer 13. Here, the effective voltage value in one field period of the signal line with respect to the pixel electrode is determined with reference to the potential of the signal line when the TFT is turned off. That is, the effective value decreases when the pixel electrode and the signal line have the same polarity voltage, and conversely when the pixel electrode and the signal line have the opposite polarity voltage, the effective value increases.

  FIG. 8 is a schematic partial cross-sectional view of the TFT substrate 10. As shown in FIG. 8, the signal line 5b and the signal line 6b coupled to the second red picture element 2b have opposite polarities, but are coupled to the first blue picture element 4a. The signal line 7a and the signal line 5b have the same polarity (plus). As described above, when each of the picture element groups 1a and 1b includes an odd number of picture elements (three picture elements in the present embodiment), the picture elements 2a and 1b included in the first picture element group 1a are included. Among the pixels 3a and 4a, the pixel closest to the second pixel group 1b (the first blue pixel 4a in this embodiment) is sandwiched between the signal lines having the same polarity.

  Accordingly, the effective voltage applied to the liquid crystal layer 13 is lower in the first blue picture element 4a than in other picture elements such as the second red picture element 2b. Therefore, in the case of a stripe arrangement, a vertical (column direction) line including the first blue picture element 4a may cause a display defect. Specifically, in the case of a normally white mode display device, the vertical line may become a bright line, and in the case of a normally black mode display device, there is a possibility that it becomes a black line. In addition, since the bright line in the black display is easily visually recognized as compared with the black line in the white display, the influence on the display quality is greater.

  However, since the blue visibility is lower than that of red and green, even if the effective voltage decreases, it is difficult to cause a display problem. For example, when the amplitude of the signal line is 6V, the difference in effective voltage is about 0.2V, which is about 20% when converted into luminance. However, since the difference in luminance of blue corresponds to a visibility of 1/6 that of green, it can be apparently suppressed to a luminance difference of about 3%. Therefore, by reducing the picture element sandwiched between the signal lines having the same polarity to a blue picture element, it is possible to suppress a reduction in display quality due to a reduction in effective voltage.

(Embodiment 2)
In the liquid crystal display device of the present invention, the aperture ratio of a picture element sandwiched between signal lines having the same polarity may be different from the aperture ratio of other picture elements of the same color included in the same pixel. For example, when the aperture ratio of a picture element sandwiched between signal lines having the same polarity is relatively high, generation of a black line in a normally black mode display device can be suppressed. On the contrary, when the aperture ratio of the picture element sandwiched between the signal lines having the same polarity is relatively lowered, generation of bright lines in the normally white mode display device can be suppressed.

  FIG. 9 is a schematic diagram of one pixel in the liquid crystal display device according to the second embodiment. In the following drawings, components having substantially the same functions as the components of the liquid crystal display device of Embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.

  In the liquid crystal display device of the present embodiment, the first blue picture element 4a sandwiched between the signal lines 7a and 5b adjacent to each other in the row direction has the second blue picture element of the same color included in the same pixel 1. Lower than the aperture ratio of 4b. Specifically, the aperture ratio of the first blue picture element 4a is low in the range of 10% to 30% of the aperture ratio of the second blue picture element 4b, for example, about 20%.

  In the liquid crystal display device of this embodiment, the aperture ratio of the first blue picture element 4a sandwiched between the signal lines 7a and 5b having the same polarity is set to be relatively low. Therefore, by applying this liquid crystal display device to a normally white mode display device, generation of bright lines can be suppressed as compared with the display device of the first embodiment.

(Embodiment 3)
In the first and second embodiments, the case where each of the pixel groups 1a and 1b is composed of the red, green, and blue three-color picture elements 2, 3, and 4 has been described. The hue is not limited to these. In the present embodiment, a case will be described in which each picture element group 1a, 1b is composed of three color picture elements of cyan, magenta, and yellow.

  FIG. 10 is a schematic diagram of one pixel in the liquid crystal display device of the present embodiment, in which the polarities of the picture elements included in one pixel are also shown. Similarly to Embodiments 1 and 2, in this embodiment, one pixel 1 is composed of two sets of picture element groups 1a and 1b adjacent in the row direction. Each of the pixel groups 1a and 1b has yellow, cyan, and magenta three-color picture elements 22, 23, and 24 that are periodically arranged in one direction (in this embodiment, the row direction). Specifically, the first and second yellow picture elements 22a and 22b, the first and second cyan picture elements 23a and 23b, and the first and second magenta picture elements 24a and 24b are included in one pixel 1.

  Also in this embodiment, the same color picture elements included in one pixel 1 are driven by the same signal. Specifically, a yellow pixel signal line 25 for supplying a video signal to the yellow pixel 22 is branched into two signal lines 25a and 25b, and one video signal is branched into two. The first and second yellow picture elements 22a and 22b are driven. Similarly, the signal line for cyan picture element 26 and the signal line for magenta picture element 27 are branched into two signal lines 26a, 26b, 27a, and 27b, respectively. The elements 23 and 24 are driven.

  The pixel 1 shown in FIG. 10 has a polarity of + .-. +. + .-. + In order from the left picture element 22a. In other words, a positive polarity signal is sent from the yellow pixel signal line 25 to the first and second yellow picture elements 22a and 22b, and from the magenta pixel signal line 27 to the first and second magenta picture elements 24a and 24b. (Voltage) is applied, and a negative polarity signal (voltage) is applied from the cyan pixel signal line 26 to the first and second cyan picture elements 23a, 23b. That is, the first magenta picture element 24a is sandwiched between signal lines 27a and 25b that supply voltages of the same polarity (positive polarity in FIG. 10), and the other five picture elements 22a and 23a other than the first magenta picture element 24a. , 22b, 23b, and 24b are sandwiched between signal lines 25, 26, and 27 that supply voltages of opposite polarity. For example, the first yellow picture element 22a is sandwiched between a positive polarity signal line 25a and a negative polarity signal line 26a. Therefore, the effective voltage applied to the liquid crystal layer 13 is lower in the first magenta picture element 24a than in other picture elements such as the second magenta picture element 24b. Therefore, in the case of the stripe arrangement, the vertical (column direction) line including the first magenta picture element 24a may become a display defect.

  However, the visibility of magenta is lower than that of yellow and cyan. In other words, the magenta picture element 24 has the lowest visibility among the picture elements 22, 23 and 24 constituting the picture element groups 1a and 1b. Therefore, even if the effective voltage of the first magenta picture element 24a is lowered, it is unlikely to cause a display problem. Therefore, the effective voltage can be reduced by using a magenta picture element between the signal lines having the same polarity. It is possible to suppress the deterioration of display quality due to.

  In this embodiment, the aperture ratio of the first magenta picture element 24a sandwiched between signal lines having the same polarity is substantially the same as the aperture ratio of the second magenta picture element 24b of the same color included in the same pixel 1. Similar to the second mode, both aperture ratios may be different. For example, the aperture ratio of the first magenta picture element 24a may be low in the range of 10% to 30% (for example, about 20%) of the aperture ratio of the second magenta picture element 24b of the same color included in the same pixel 1. .

  Also in this embodiment, the polarity inversion pattern of the pixel 1 is two types of +,-, +, +,-, + and-, +,-,-, +,-. It is preferable to adjoin in the direction. As a result, the polarities of two adjacent picture elements between the two pixels are reversed, so that flicker is difficult to recognize and shadowing (crosstalk via the power supply line) is prevented.

(Embodiment 4)
In the first to third embodiments described above, the case where each of the pixel groups 1a and 1b is composed of three color picture elements has been described. However, in the present invention, the number of hues of the picture elements is not limited thereto. In the present embodiment, a case will be described in which each picture element group 1a, 1b is composed of four color picture elements of red, green, blue and white.

  FIG. 11 is a schematic diagram of one pixel in the liquid crystal display device of the present embodiment, and the polarities of the picture elements included in one pixel are also shown. Similarly to Embodiments 1 to 3, in this embodiment, one pixel 1 is composed of two sets of pixel groups 1a and 1b adjacent in the row direction. Each of the picture element groups 1a and 1b has picture elements 2, 3, 4, and 9 of four colors of red, green, blue, and white that are periodically arranged in one direction (in this embodiment, the row direction). is doing. Specifically, the first and second red picture elements 2a, 2b, the first and second green picture elements 3a, 3b, the first and second blue picture elements 4a, 4b, the first and second white picture elements 9a, 9b is included in one pixel 1.

  Also in this embodiment, the same color picture elements included in one pixel 1 are driven by the same signal. Specifically, the red picture element signal line 5, the green picture element signal line 6, the blue picture element signal line 7 and the white picture element signal line 8 are respectively two signal lines 5a, 5b, 6a, 6b and 7a. , 7b, 8a, 8b, and the bifurcated video signal drives the picture elements 2, 3, 4, 9 of the same color.

  In the present embodiment, the polarity inversion pattern of the pixel 1 is assumed to be two types: + • − • + • − • + • − • + • − and − • + • − • + • − • + • − • +. These two patterns are preferably adjacent in the row direction. In other words, the polarities of the eight picture elements 2, 3, 4, and 9 included in one pixel 1 out of two pixels 1 adjacent in the row direction are + .-. + .-. + .-. + .- It is preferable that the polarities of the eight picture elements 2, 3, 4 and 9 included in the other pixel 1 are-. + .-. + .-. + .-. +. As a result, the polarities of two adjacent picture elements between the two pixels are reversed, so that flicker is difficult to recognize and shadowing (crosstalk via the power supply line) is prevented.

  The pixel 1 shown in FIG. 11 has a polarity of + .-. + .-. + .-. + .- in order from the left picture element 2a. In other words, all the picture elements 2, 3, 4, and 9 are sandwiched between signal lines 5, 6, 7, and 8 that supply voltages of opposite polarity. Therefore, in this embodiment, display defects due to a decrease in effective voltage are unlikely to occur.

  In this embodiment, each pixel group 1a, 1b is comprised from the picture element of four colors of red, green, blue, and white. Since the visibility of these four colors decreases in the order of white> green> red> blue, stripes are visually recognized between the white picture element 9 having the highest visibility and the blue picture element 4 having the lowest visibility. . In this embodiment, as shown in FIG. 11, the blue picture element 4 with the lowest visibility is sandwiched between the white picture element 9 with the highest visibility and the green picture element 3 with the second highest visibility in the row direction. Are arranged. By arranging in this way, it becomes difficult to visually recognize the stripes.

(Embodiment 5)
In the present embodiment, a case will be described in which each picture element group 1a, 1b is composed of five color picture elements of red, green, blue, yellow and cyan. FIG. 12 is a schematic diagram of one pixel in the liquid crystal display device of the present embodiment, in which the polarities of the picture elements included in one pixel are also shown.

  Similarly to Embodiments 1 to 4, in this embodiment, one pixel 1 is composed of two sets of pixel groups 1a and 1b adjacent in the row direction. Each of the picture element groups 1a and 1b is a picture element 22, 23, 2, 3 of five colors of yellow, cyan, red, green and blue, which are periodically arranged in one direction (in this embodiment, the row direction). , 4. Specifically, the first and second yellow picture elements 22a and 22b, the first and second cyan picture elements 23a and 23b, the first and second red picture elements 2a and 2b, the first and second green picture elements 3a, 3b, first and second blue picture elements 4a and 4b are included in one pixel 1.

  Also in this embodiment, the same color picture elements included in one pixel 1 are driven by the same signal. Specifically, a yellow pixel signal line 25 for supplying a video signal to the yellow pixel 22 is branched into two signal lines 25a and 25b, and one video signal is branched into two. The first and second yellow picture elements 22a and 22b are driven. Similarly, the signal line 26 for cyan picture element, the signal line 5 for red picture element, the signal line 6 for green picture element, and the signal line 7 for blue picture element are each two signal lines 26a, 26b, 5a, 5b, 6a, 6b, 7a, and 7b, and the video signal branched in two drives the picture elements 23, 2, 3, and 4 of the same color.

  In this embodiment, the polarity inversion pattern of the pixel 1 is changed to + .-. + .-. +. + .-. + .-. + And-. + .-. + .-.-. + .-. +. -Two types. These two patterns are preferably adjacent in the row direction. In other words, the polarities of the ten picture elements 22, 23, 2, 3, and 4 included in one pixel 1 out of two pixels 1 adjacent in the row direction are + .-. + .-. +. +. -, +,-, +, And the polarities of the ten picture elements 22, 23, 2, 3, 4 included in the other pixel 1 are-, +,-, +,-,-, +,-. It is preferable that it is + · −. As a result, the polarities of two adjacent picture elements between the two pixels are reversed, so that flicker is difficult to recognize and shadowing (crosstalk via the power supply line) is prevented.

  The pixel 1 shown in FIG. 12 has polarities of +,-, +,-, +, +,-, +,-, + in order from the left picture element 22a. In other words, the first and second yellow picture elements 22a and 22b from the yellow picture element signal line 25, the first and second red picture elements 2a and 2b from the red picture element signal line 5, and further the blue picture element signal. A positive polarity signal (voltage) is applied from the line 7 to the first and second blue picture elements 4a and 4b. On the other hand, a negative polarity signal (from the cyan picture element signal line 26 to the first and second cyan picture elements 23a and 23b, and from the green picture element signal line 6 to the first and second green picture elements 3a and 3b, respectively. Voltage) is applied. That is, the first blue picture element 4a is sandwiched between signal lines 7a and 25b that supply voltages of the same polarity (positive polarity in FIG. 12), and the other nine picture elements 22a and 22b other than the first blue picture element 4a. , 23a, 23b, 2a, 2b, 3a, 3b, 4b are sandwiched between signal lines 25, 26, 5, 6, and 7 for supplying voltages of opposite polarity. Accordingly, the effective voltage applied to the liquid crystal layer 13 is lower in the first blue picture element 4a than in other picture elements such as the second blue picture element 4b. Therefore, in the case of a stripe arrangement, a vertical (column direction) line including the first blue picture element 4a may cause a display defect.

  However, the blue picture element 4 has the lowest visibility among the picture elements 22, 23, 2, 3, and 4 constituting the picture element groups 1a and 1b. Therefore, even if the effective voltage of the first blue picture element 4a is lowered, it is unlikely to cause a display problem. Therefore, by making the picture element sandwiched between the signal lines of the same polarity into a blue picture element, the effective voltage is reduced. A reduction in display quality can be suppressed.

  In this embodiment, the aperture ratio of the first blue picture element 4a sandwiched between the signal lines having the same polarity is substantially the same as the aperture ratio of the second blue picture element 4b of the same color included in the same pixel 1. Similar to the second mode, both aperture ratios may be different. For example, the aperture ratio of the first blue picture element 4a may be low in the range of 10% to 30% (for example, about 20%) of the aperture ratio of the second blue picture element 4b of the same color included in the same pixel 1. .

  In this embodiment, each pixel group 1a, 1b is comprised from the picture element of five colors, red, green, blue, yellow, and cyan. Stripes are visually recognized between the green picture element 3 having the highest visibility and the blue picture element 4 having the lowest visibility among these five color picture elements. In the present embodiment, as shown in FIG. 12, the blue picture element 4 having the lowest visibility is sandwiched between the green picture element 3 having the highest visibility and the yellow picture element 22 having the second highest visibility in the row direction. Are arranged. By arranging in this way, it becomes difficult to visually recognize the stripes.

(Other embodiments)
In the first to fifth embodiments described above, the case where the pixel array is a stripe array has been described, but a delta array, a mosaic array, or a square array may be employed. In the first to fifth embodiments, the pixel 1 includes two sets of pixel groups 1a and 1b. However, the pixel may include three or more sets of pixel groups. The number of picture elements of one hue included in the picture element group may be different from the number of picture elements of another hue. For example, four picture elements of red, blue, green and blue may be included in one picture element group. Further, the order of the pixel arrangement included in the pixel group is not limited to that illustrated in the first to fifth embodiments. For example, when red, green and blue picture elements are included in the picture element group, in the first embodiment, the picture elements are arranged in the order of red, green and blue in the row direction, but the picture elements are arranged in the order of red, blue and green in the row direction. May be.

  As mentioned above, although preferable embodiment of this invention was described, the technical scope of this invention is not limited to the range as described in the said embodiment. It is understood by those skilled in the art that the above embodiment is an exemplification, and that various modifications can be made to the combination of each component and each processing process, and such modifications are also within the scope of the present invention. By the way. For example, the liquid crystal driving elements are not limited to TFTs, and other active driving elements such as MIM (Metal Insulator Metal) may be used, or passive (multiplex) driving without using driving elements may be used. The present invention is not limited to the TN mode, but can be applied to other liquid crystal systems such as an IPS (In-Plane Switching) mode and an MVA (Multi-domain Vertical Alignment) mode. Furthermore, the liquid crystal display device is not limited to a transmission type, but can be applied to both a reflection type and a transmission / reflection type.

  The display device of the present invention includes various displays such as LCD, PDP, inorganic or organic EL display device, LED display device, fluorescent display tube, field emission display device, electrophoretic display device, electrochromic display device, and CRT display device. Can be used in the device. For example, it can be used for a display of a personal computer, a display of an amusement device such as a pachinko, a display of a portable terminal, a color television, and the like.

It is a figure called Campbell-Robson CSF Chart. It is a graph which shows the resolution limit curve measured using Campbell-Robson CSF Chart. 2 is a partial cross-sectional view schematically showing the liquid crystal display device of Embodiment 1. FIG. 3 is a schematic diagram of one pixel in the liquid crystal display device of Embodiment 1. FIG. It is a graph which shows the resolution limit curve which filled in the value of the line & space of each display of Embodiment 1 and a prior art example. It is a typical top view explaining the manufacturing process in the intersection vicinity of the signal line 6a for 1st green picture elements, and the signal line 5b for 2nd red picture elements. It is a figure which shows the polarity of each pixel contained in one pixel. 2 is a schematic partial cross-sectional view of a TFT substrate 10. FIG. 6 is a schematic diagram of one pixel in the liquid crystal display device of Embodiment 2. FIG. 6 is a schematic diagram of one pixel in the liquid crystal display device of Embodiment 3. FIG. 6 is a schematic diagram of one pixel in the liquid crystal display device of Embodiment 4. FIG. FIG. 6 is a schematic diagram of one pixel in a liquid crystal display device according to a fifth embodiment. It is a schematic plan view of a general pixel.

1 pixel 1a, 1b picture element group 2 red picture element (red color filter layer)
2a First red picture element 2b Second red picture element 3 Green picture element (green color filter layer)
3a First green picture element 3b Second green picture element 4 Blue picture element (blue color filter layer)
4a First blue picture element 4b Second blue picture element 5 Red picture element signal line 6 Green picture element signal line 7 Blue picture element signal line 8 White picture element signal line 9 White picture element 10 TFT substrate 11 Color filter substrate 12 Peripheral sealing material 13 Liquid crystal layers 14 and 15 Polarizing plate 16 Picture element transparent electrode 17 Liquid crystal alignment film 18 Light shielding layer 19 Common transparent electrode 20 Liquid crystal alignment film 22 Yellow picture element 22a First yellow picture element 22b Second yellow picture element 23 Cyan Picture Element 23a First Cyan Picture Element 23b Second Cyan Picture Element 24 Magenta Picture Element 24a First Magenta Picture Element 24b Second Magenta Picture Element 25 Yellow Picture Element Signal Line 26 Cyan Picture Element Signal Line 27 Magenta Picture Element Signal Line 30 Connection 31 Interlayer insulating film 101 Pixel 102 Red picture element 103 Green picture element 104 Blue picture element 105 Red picture element signal line 106 Green picture element signal line 107 Blue picture element signal line

Claims (11)

A display device having a plurality of pixels arranged in a matrix,
The pixel has a plurality of pixel groups each including three or more colors, and the pixels of the same color included in the pixel are driven by the same signal .
The pixel is composed of two sets of pixel groups adjacent in the row direction, and each of the two sets of pixel groups is composed of three or more color pixels periodically arranged in one direction,
Each of the two sets of picture element groups is composed of three color picture elements periodically arranged in one direction, and the polarity of the picture element included in one of the two pixels adjacent in the row direction Is + .-. +. + .-. +, And the polarity of the picture element contained in the other pixel is-. + .-.-. + .-
A plurality of signal lines extending in a column direction and electrically connected to the picture elements, the picture elements sandwiched between two signal lines adjacent in a row direction, and the signals having the same polarity; The display device, wherein an aperture ratio of the picture element sandwiched between lines is different from an aperture ratio of another picture element of the same color included in the pixel. A display device having a plurality of pixels arranged in a matrix,
The pixel has a plurality of pixel groups each including three or more colors, and the pixels of the same color included in the pixel are driven by the same signal.
The pixel is composed of two sets of pixel groups adjacent in the row direction, and each of the two sets of pixel groups is composed of three or more color pixels periodically arranged in one direction,
Each of the two sets of picture element groups is composed of five color picture elements periodically arranged in one direction, and the polarity of the picture element included in one of the two pixels adjacent in the row direction. Is + .-. + .-. +. + .-. + .-. + And the polarity of the picture element contained in the other pixel is-. + .-. + .-.-. + .- +/-, and the polarity of the picture element is inverted at a predetermined cycle,
A plurality of signal lines extending in a column direction and electrically connected to the picture elements, the picture elements sandwiched between two signal lines adjacent in a row direction, and the signals having the same polarity; The display device, wherein an aperture ratio of the picture element sandwiched between lines is different from an aperture ratio of another picture element of the same color included in the pixel. A display device having a plurality of pixels arranged in a matrix,
The pixel has a plurality of pixel groups each including three or more colors, and the pixels of the same color included in the pixel are driven by the same signal.
The pixel is composed of two sets of pixel groups adjacent in the row direction, and each of the two sets of pixel groups is composed of three or more color pixels periodically arranged in one direction,
Each of the two sets of picture element groups is composed of three color picture elements periodically arranged in one direction, and the polarity of the picture element included in one of the two pixels adjacent in the row direction Is + .-. +. + .-. +, The polarity of the pixel included in the other pixel is-. + .-.-. + .-, and the polarity of the pixel is at a predetermined period. Invert,
A plurality of signal lines extending in a column direction and electrically connected to the picture elements, the picture elements sandwiched between two signal lines adjacent in a row direction, and the signals having the same polarity; The aperture ratio of the picture element having the lowest visibility among the picture elements constituting the group of picture elements sandwiched between lines is 10% higher than the aperture ratio of the other picture elements of the same color included in the pixel. The display device is low in the range of 30% or less. A display device having a plurality of pixels arranged in a matrix,
The pixel has a plurality of pixel groups each including three or more colors, and the pixels of the same color included in the pixel are driven by the same signal.
The pixel is composed of two sets of pixel groups adjacent in the row direction, and each of the two sets of pixel groups is composed of three or more color pixels periodically arranged in one direction,
Each of the two sets of picture element groups is composed of five color picture elements periodically arranged in one direction, and the polarity of the picture element included in one of the two pixels adjacent in the row direction. Is + .-. + .-. +. + .-. + .-. + And the polarity of the picture element contained in the other pixel is-. + .-. + .-.-. + .- +/-, and the polarity of the picture element is inverted at a predetermined cycle,
A plurality of signal lines extending in a column direction and electrically connected to the picture elements, the picture elements sandwiched between two signal lines adjacent in a row direction, and the signals having the same polarity; The aperture ratio of the picture element having the lowest visibility among the picture elements constituting the group of picture elements sandwiched between lines is 10% higher than the aperture ratio of the other picture elements of the same color included in the pixel. The display device is low in the range of 30% or less. A display device having a plurality of pixels arranged in a matrix,
The pixel has a plurality of pixel groups each including three or more colors, and the pixels of the same color included in the pixel are driven by the same signal.
The pixel is composed of two sets of pixel groups adjacent in the row direction, and each of the two sets of pixel groups is composed of three or more color pixels periodically arranged in one direction,
Each of the two sets of picture element groups is composed of three color picture elements periodically arranged in one direction, and the polarity of the picture element included in one of the two pixels adjacent in the row direction Is + .-. +. + .-. +, The polarity of the pixel included in the other pixel is-. + .-.-. + .-, and the polarity of the pixel is at a predetermined period. Invert,
A plurality of signal lines extending in a column direction and electrically connected to the picture elements, the picture elements sandwiched between two signal lines adjacent in a row direction, and the signals having the same polarity; The display device, wherein the picture element sandwiched between lines is a picture element having the lowest visibility among the picture elements constituting the picture element group. A display device having a plurality of pixels arranged in a matrix,
The pixel has a plurality of pixel groups each including three or more colors, and the pixels of the same color included in the pixel are driven by the same signal.
The pixel is composed of two sets of pixel groups adjacent in the row direction, and each of the two sets of pixel groups is composed of three or more color pixels periodically arranged in one direction,
Each of the two sets of picture element groups is composed of five color picture elements periodically arranged in one direction, and the polarity of the picture element included in one of the two pixels adjacent in the row direction. Is + .-. + .-. +. + .-. + .-. + And the polarity of the picture element contained in the other pixel is-. + .-. + .-.-. + .- +/-, and the polarity of the picture element is inverted at a predetermined cycle,
A plurality of signal lines extending in a column direction and electrically connected to the picture elements, the picture elements sandwiched between two signal lines adjacent in a row direction, and the signals having the same polarity; The display device, wherein the picture element sandwiched between lines is a picture element having the lowest visibility among the picture elements constituting the picture element group. Has further a drive circuit for outputting a signal for driving the picture elements, said the signals output from the drive circuit is branched into a plurality of claims 1 to drive the picture elements of the same color 6 The display device according to any one of the above . The picture element having the lowest visibility among the picture elements constituting the picture element group is sandwiched in the row direction by the picture element having the highest visibility and the color element having the second highest visibility. display device according to any one of claims 1 disposed 7. The display device according to claim 1 , wherein the group of picture elements is composed of picture elements of three colors of red, green, and blue. The display device according to claim 1 , wherein the picture element group is composed of picture elements of three colors of cyan, magenta, and yellow . The display device according to any one of claims 2, 4, and 6 , wherein the picture element group includes five color picture elements of red, green, blue, yellow, and cyan.